Mill stand roll assembly

Abstract

The invention relates to rolling, and more particularly, to a mill stand roll assembly comprising grooved rolls. A thrust shoulder for each of the rolls, formed on a roll neck, is located inside a thrust hydrostatic bearing placed in a chock secured to a housing. Each thrust has disks each being arranged on both end faces of each thrust shoulder in parallel thereto and forming with the chock a cavity communicating via an orifice in the chock with a source of liquid. Each thrust shoulder having an annular slot coaxial with the corresponding roll for accommodating two washers secured to a chock in a parallel and spacial relationship with one another. A hole in the chock is disposed so as to permit a flow of liquid to pass between the washers. The liquid delivery rate is adjustable with respect to the amount of roll displacement and the roll assembly makes it possible to adjust the mutual arrangement of rolls directly in the process of rolling.

We claim: 
     
       1. A mill stand roll assembly comprising: a mill stand roll housing; chocks secured to said housing and each having a hole for supporting a grooved roll; two washers, disposed between spacer rings, are provided in a bearing housing on each of said chocks and are disposed in a parallel and spacial relationship with one another and said washers are on both sides of a hole of said housing; one of said spacer rings being centrally disposed between said two washers and having a plurality of radial holes communicating with said hole in said housing; a thrust, hydrostatic bearing mounted in said housing and placed in each of said chocks; said grooved rolls comprising two and each having a neck, mounted in said hydrostatic bearings, a drive for said grooved rolls; a pair of thrust shoulders on each of said necks of said grooves rolls and having end faces; annular slots or gaps formed on each side of said thrust shoulders and being substantially coaxially with a respective grooved roll; one of said annular slots being between said pair of thrust shoulders and accommodating two said washers; a source of liquid having an adjustable flow as a function of the displacement of said grooved rolls; and thrust disks for each of said thrust hydrostatic bearings disposed at the outer end faces of each pair of said shoulders and being substantially in parallel therewith and forming with said thrust shoulders said annular slots or gaps which are in communication with said source of liquid through said holes in said housings, whereby a hydrostatic pressure field of said liquid is developed on a thrust shoulder for balancing an applied axial load on said grooved rolls during use of said assembly. 
     
     
       2. The mill stand roll assembly according to claim 1, wherein said washers are elastic. 
     
     
       3. The mill stand roll assembly according to claim 1, including covers secured to said chocks for precluding leakage of said liquid from said thrust, hydrostatic bearings. 
     
     
       4. The mill stand roll assembly according to claim 3, wherein said assembly includes means enabling an accurate alignment of said grooved rolls. 
     
     
       5. The mill stand roll assembly according to claim 1, wherein said assembly includes a plurality of grooved rolls. 
     
     
       6. The mill stand roll assembly according to claim 1, wherein said neck of each said grooved roll is integral and coaxial therewith. 
     
     
       7. The mill stand roll assembly according to claim 6, wherein said neck is formed by a truncated cone portion and a cylindrical portion, and said pair of thrust shoulders are disposed about said cylindrical portion. 
     
     
       8. The mill stand roll assembly according to claim 1, wherein each neck of said grooved rolls are mounted in a radial bearing having a trunnion and a bushing. 
     
     
       9. The mill stand roll assembly according to claim 1, wherein said pair of thrust shoulders are formed directly on the neck of said grooved roll. 
     
     
       10. The mill stand roll assembly according to claim 1, wherein a nut is provided to secure said thrust, hydrostatic bearing inside said bearing housing.